Ah
Got a answer from EA. I sent this mail to them yesterday evening:
Hello.
I would like to delete my online Medal of Honor: Heroes 2 persona.
Could someone do this for me? So that my account is gone and that I am not visibe at the top 100 leaderbord anymore? Please 
I cheated a lot at this account. I was playing unfair, so I dont deserve it to be at the top 100.
My persona: TaGxHeadshot
My password: **********
My email: Timo_siezen_@hotmail.com
Is this enough enough information and is it possible to delete my account? I want to start over and play fair.
Thanks.
___
Answer I got:
Hello,
Thank you for contacting Electronic Arts.
Please be informed that Medal of Honor: Heroes 2 persona name cannot be changed/removed from our databse as we do not have the option to delete it. I apologize for the inconvenience. I am sorry if I could not offer direct resolution to your concern.
Is there anything else we can help you with, please let us know.
Regards,
Patrick
EA Online Support
__
Darn 